Comment 2 for bug 1053670

StacktraceTop:
 g_type_check_instance_cast (type_instance=type_instance@entry=0x188f800, iface_type=25005616) at /build/buildd/glib2.0-2.33.14/./gobject/gtype.c:3997
 settings_notify_cb (settings=0x165fa80, pspec=0x165f990, data=0x188f800) at /build/buildd/libdbusmenu-12.10.1/./libdbusmenu-gtk/parser.c:1327
 g_closure_invoke (closure=0x1c530e0, return_value=0x0, n_param_values=2, param_values=0x7fff6d7dbb70, invocation_hint=0x7fff6d7dbb10) at /build/buildd/glib2.0-2.33.14/./gobject/gclosure.c:777
 signal_emit_unlocked_R (node=node@entry=0x15f9530, detail=detail@entry=700, instance=instance@entry=0x165fa80, emission_return=emission_return@entry=0x0, instance_and_params=instance_and_params@entry=0x7fff6d7dbb70) at /build/buildd/glib2.0-2.33.14/./gobject/gsignal.c:3551
 g_signal_emit_valist (instance=0x165fa80, signal_id=<optimized out>, detail=700, var_args=var_args@entry=0x7fff6d7dbdc8) at /build/buildd/glib2.0-2.33.14/./gobject/gsignal.c:3300